Yes, its possible for mojoPortal to support any language. All that is required is to translate the resource files.
Text for labels and buttons come from resources files that can be created or edited using Visual Studio 2008 SP1 or the free Visual Web Developer Express 2008 SP1. It may be possible to edit them wuith a text editor but its easier using the development environment.
See this document: http://www.mojoportal.com/translatingmojoportal.aspx
If you do translate the resources, when you complete them, please create a .zip file and send them to me at joe dot audette at g mail dotcom, so we can include them in the project.